<template>
  <div>
    <table
      border="1"
      width="700"
      style="border-collapse: collapse"
    >
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th>
            <input type="checkbox" v-model="sp" /> <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      
      </thead>
      <tbody>
        <tr v-for="(itms,index) in goodList" :key="index">
          <td>
            <input type="checkbox" v-model="itms.checked" />
          </td>
          <td>{{itms.name}}</td>
          <td>{{itms.price}}</td>
          <td><button @click="itms.num <= 1 || itms.num--">-</button>{{itms.num}}<button @click="itms.num++">+</button></td>
          <td>{{itms.price * itms.num}}</td>
          <td><button @click="dele(index)">删除</button></td>
        </tr>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:{{sum}}</td>
          <td colspan="5">
            
          </td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      goodList: [
        
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  methods:{
    dele(a){
      this.goodList.splice(a,1)
    }
  },
  computed:{
    sp:{
      set(a){
        this.goodList.forEach(itms => itms.checked = a)
      },
      get(){
       return this.goodList.every(itms => itms.checked === true)
      }
    },
    sum(){
      
      return this.goodList.reduce((sum,itms)=>{
        if(itms.checked === true){
         return  sum + (itms.price  * itms.num)
        }
        console.log(sum)
        return sum
      } ,0)
    }
  }
};
</script>

<style>
</style>